Lennox 18M40 Thermostatic Expansion Valve 3/8" x 1/2" ODF 1/4" Equalizer 30" Capillary

The Lennox 18M40 is a thermostatic expansion valve (TXV) designed for precise refrigerant flow control in residential and light commercial HVAC systems. This OEM replacement component ensures optimal system performance and efficiency by regulating refrigerant flow based on superheat conditions.

Key Specifications:

• Inlet Connection: 3/8" ODF (flare fitting)
• Outlet Connection: 1/2" ODF (flare fitting)
• External Equalizer: 1/4" connection for accurate pressure sensing
• Capillary Tube Length: 30 inches for flexible bulb positioning
• OEM Lennox part for guaranteed compatibility

This TXV features an external equalizer port that compensates for pressure drop across the evaporator, ensuring accurate superheat control in systems with significant pressure losses. The 30-inch capillary tube provides installation flexibility for proper sensing bulb placement on the suction line. Designed for use in Lennox air conditioning and heat pump systems requiring precise refrigerant metering.